Artificial teeth

Abstract

An artificial tooth has a basal plane in which an areal ratio of a labial or buccal subplane to a lingual subplane is in a range of 10:1 to 1:10, and an angle that both subplanes make with a dental axis, i.e., an angle of retention, assumes a concave shape and is in a range equal to or larger than 45° to less than 180°. A retaining hole can be provided in the basal plane of the artificial tooth so as to further improve its performance.

What is claimed is: 
     
       1. An artificial tooth having a basal plane in which an areal ration of one of a labial and a buccal subplane to a lingual subplane is in a range of 10:1 to 1:10, and wherein an angle of retention between said one of said labial and buccal subplanes and the lingual subplane is equal to or larger than 45° and less than 180° and wherein a retaining hole is provided in said one of said labial and buccal subplanes. 
     
     
       2. An artificial tooth as claimed in claim 1, wherein said retaining hole provided therein assumes a concave shape defined by gently curved faces, and is provided with no undercut. 
     
     
       3. An artificial tooth as claimed in claim 2, which is accommodative to a front-tooth portion. 
     
     
       4. An artificial tooth as claimed in claim 3, which is formed of a synthetic resin. 
     
     
       5. An artificial tooth as claimed in claim 3, which is formed of a composite material of synthetic resins and ceramics. 
     
     
       6. An artificial tooth as claimed in claim 2, which is accommodative to a molar-tooth portion. 
     
     
       7. An artificial tooth as claimed in claim 6, which is formed of a synthetic resin. 
     
     
       8. An artificial tooth as claimed in claim 6, which is formed of a composite material of synthetic resins and ceramics. 
     
     
       9. An artificial tooth as claimed in claim 2, which is formed of a synthetic resin. 
     
     
       10. An artificial tooth as claimed in claim 2, which is formed of a composite material of synthetic resins and ceramics. 
     
     
       11. An artificial tooth as claimed in claim 1, which is accommodative to a front-tooth portion. 
     
     
       12. An artificial tooth as claimed in claim 11, which is formed of a synthetic resin. 
     
     
       13. An artificial tooth as claimed in claim 11, which is formed of a composite material of synthetic resins and ceramics. 
     
     
       14. An artificial tooth as claimed in claim 1, which is accommodative to a molar-tooth portion. 
     
     
       15. An artificial tooth as claimed in claim 14, which is formed of a synthetic resin. 
     
     
       16. An artificial tooth as claimed in claim 14, which is formed of a composite material of synthetic resins and ceramics. 
     
     
       17. An artificial tooth as claimed in claim 1, which is formed of a synthetic resin. 
     
     
       18. An artificial tooth as claimed in claim 1, which is formed of a composite material of synthetic resins and ceramics.